Dual-Outlet NO Delivery for Stable Manual Ventilation Dosing
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Solution Overview
Problem
Existing NO delivery systems fail to maintain a consistent NO concentration in the gas mixture during manual ventilation or system failures, as the NO concentration varies with the oxygen flow rate, which is therapeutically undesirable.
Innovation Solution
A NO supply device with a main and backup gas circuit system, including a multi-way solenoid valve and digital display for setting a desired NO concentration, allowing independent control of NO and O2 flow rates to maintain consistent NO delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a purely pneumatic backup circuit is used to deliver O2 and fixed NO flow rate, then the system can operate during manual ventilation, but the NO concentration varies depending on the oxygen flow rate set by the user
Solution Approach 1:
The backup circuit is transformed from a purely pneumatic system to an electronically controlled system. A microprocessor-based control unit dynamically adjusts the NO flow rate based on the actual O2 flow rate measurements, enabling real-time adaptation to maintain constant NO concentration despite variations in oxygen delivery.
Solution Approach 2:
The system incorporates flow sensors that continuously measure the actual O2 and NO flow rates, feeding this information back to the microprocessor. The control unit processes this feedback and automatically adjusts the gas mixture composition to maintain the desired NO concentration, creating a closed-loop control system that ensures therapeutic accuracy.
2Ease of operation
If the NO flow rate is fixed in the backup circuit, then the system is simpler to operate, but the NO concentration cannot be precisely controlled when oxygen flow rate varies
Solution Approach 1:
The system performs self-adjustment through automated electronic control. The microprocessor continuously monitors flow rates and automatically modulates the NO delivery to maintain precise concentration control, eliminating the need for manual calibration while ensuring therapeutic accuracy. The system serves itself by detecting and correcting deviations from the target NO concentration.
3Measurement precision
If the NO supply device is equipped with electronic control means, then the NO concentration can be precisely controlled, but the device complexity increases
Solution Approach 1:
The microprocessor-based control unit serves multiple functions: it measures actual flow rates, calculates the required NO concentration, controls the gas mixture composition, and provides user interface management. By consolidating these diverse functions into a single multi-functional control unit, the system achieves precise NO concentration control without proportionally increasing overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures a stable and therapeutically accurate NO concentration in the gas mixture, even during manual ventilation or system failures, by decoupling NO concentration from oxygen flow rate variations.
Implementation Method 1
a multi-way solenoid valve and digital display for setting a desired NO concentration
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a NO supply device (1) comprising a main gas circuit (200) for delivering a NO/N2 mixture to a main outlet port (210) intended to supply the inspiratory limb (30) of a medical ventilator (2); and a backup circuit (110, 120) comprising a backup NO circuit (110) including a backup NO line (111) supplied with a NO/N2 mixture, and a backup O2 circuit (120) including a main O2 line (121) fluidically connecting (130) to the backup NO line (111) to form a common line (140) in fluidic communication with a secondary outlet (141) supplying a NO/N2/O2 mixture intended to supply a manual insufflation bag.